Employee Benefit Plans - Assumptions Used to Determine Accumulated Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Pension Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate (as a percent)	3.65%	3.58%
Measurement date	December 31, 2015(a)	December 31, 2014
Post-Employment Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate (as a percent)	3.20%	2.99%
Measurement date	December 31, 2015	December 31, 2014